Tesla’s investors, captivated by the electric car maker’s future growth prospects, have ignored its rickety finances. That is no longer possible.

Tesla is in trouble after a chaotic week. Elon Musk’s supposed plan to take the company private at $420 a share looks more like a fantasy. The Securities and Exchange Commission is investigating the company on multiple fronts, including issues related to disclosure about production of the Model 3 sedan. Shares dove 8% Friday morning.